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   <div id="projectname">Reranker Framework (ReFr)
   
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   <div id="projectbrief">Reranking framework for structure prediction and discriminative language modeling</div>
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<a href="model_8_c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Copyright 2012, Google Inc.</span>
<a name="l00002"></a>00002 <span class="comment">// All rights reserved.</span>
<a name="l00003"></a>00003 <span class="comment">//</span>
<a name="l00004"></a>00004 <span class="comment">// Redistribution and use in source and binary forms, with or without</span>
<a name="l00005"></a>00005 <span class="comment">// modification, are permitted provided that the following conditions are</span>
<a name="l00006"></a>00006 <span class="comment">// met:</span>
<a name="l00007"></a>00007 <span class="comment">//</span>
<a name="l00008"></a>00008 <span class="comment">//   * Redistributions of source code must retain the above copyright</span>
<a name="l00009"></a>00009 <span class="comment">//     notice, this list of conditions and the following disclaimer.</span>
<a name="l00010"></a>00010 <span class="comment">//   * Redistributions in binary form must reproduce the above</span>
<a name="l00011"></a>00011 <span class="comment">//     copyright notice, this list of conditions and the following disclaimer</span>
<a name="l00012"></a>00012 <span class="comment">//     in the documentation and/or other materials provided with the</span>
<a name="l00013"></a>00013 <span class="comment">//     distribution.</span>
<a name="l00014"></a>00014 <span class="comment">//   * Neither the name of Google Inc. nor the names of its</span>
<a name="l00015"></a>00015 <span class="comment">//     contributors may be used to endorse or promote products derived from</span>
<a name="l00016"></a>00016 <span class="comment">//     this software without specific prior written permission.</span>
<a name="l00017"></a>00017 <span class="comment">//</span>
<a name="l00018"></a>00018 <span class="comment">// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS</span>
<a name="l00019"></a>00019 <span class="comment">// &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT</span>
<a name="l00020"></a>00020 <span class="comment">// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR</span>
<a name="l00021"></a>00021 <span class="comment">// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT</span>
<a name="l00022"></a>00022 <span class="comment">// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,</span>
<a name="l00023"></a>00023 <span class="comment">// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT</span>
<a name="l00024"></a>00024 <span class="comment">// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,</span>
<a name="l00025"></a>00025 <span class="comment">// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY</span>
<a name="l00026"></a>00026 <span class="comment">// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT</span>
<a name="l00027"></a>00027 <span class="comment">// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE</span>
<a name="l00028"></a>00028 <span class="comment">// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>
<a name="l00029"></a>00029 <span class="comment">// -----------------------------------------------------------------------------</span>
<a name="l00030"></a>00030 <span class="comment">//</span>
<a name="l00031"></a>00031 <span class="comment">//</span>
<a name="l00037"></a>00037 <span class="comment"></span>
<a name="l00038"></a>00038 <span class="preprocessor">#include &lt;cstdlib&gt;</span>
<a name="l00039"></a>00039 <span class="preprocessor">#include &lt;iostream&gt;</span>
<a name="l00040"></a>00040 <span class="preprocessor">#include &lt;sstream&gt;</span>
<a name="l00041"></a>00041 <span class="preprocessor">#include &lt;stdexcept&gt;</span>
<a name="l00042"></a>00042 
<a name="l00043"></a>00043 <span class="preprocessor">#include &quot;<a class="code" href="tokenizer_8_h.html" title="Provides the Tokenizer  class.">tokenizer.H</a>&quot;</span>
<a name="l00044"></a>00044 <span class="preprocessor">#include &quot;<a class="code" href="model_8_h.html" title="Reranker model interface.">model.H</a>&quot;</span>
<a name="l00045"></a>00045 
<a name="l00046"></a>00046 <span class="keyword">using namespace </span>std;
<a name="l00047"></a>00047 
<a name="l00048"></a>00048 <span class="keyword">namespace </span>reranker {
<a name="l00049"></a>00049 
<a name="l00050"></a>00050 <a class="code" href="factory_8_h.html#a01b208854b036ee1381a9289186ff3c2" title="Provides the necessary implementation for a factory for the specified BASE class type.">IMPLEMENT_FACTORY</a>(Model)
<a name="l00051"></a>00051 <a class="code" href="factory_8_h.html#a01b208854b036ee1381a9289186ff3c2" title="Provides the necessary implementation for a factory for the specified BASE class type.">IMPLEMENT_FACTORY</a>(Model::UpdatePredicate)
<a name="l00052"></a>00052 <a class="code" href="factory_8_h.html#a01b208854b036ee1381a9289186ff3c2" title="Provides the necessary implementation for a factory for the specified BASE class type.">IMPLEMENT_FACTORY</a>(Model::Updater)
<a name="l00053"></a>00053 
<a name="l00054"></a><a class="code" href="namespacereranker.html#a1acd13da2bcc79a41cbeaf3ed463836a">00054</a> <a class="code" href="candidate_8_h.html#a3a141a31e6cc4e263362be43bd12ee78">REGISTER_CANDIDATE_COMPARATOR</a>(<a class="code" href="classreranker_1_1_default_score_comparator.html" title="The default comparator for comparing two Candidate instances based on their respective scores (i...">DefaultScoreComparator</a>)
<a name="l00055"></a><a class="code" href="namespacereranker.html#a6612158b758276e56dd6241821d5394a">00055</a> <a class="code" href="candidate_8_h.html#a3a141a31e6cc4e263362be43bd12ee78">REGISTER_CANDIDATE_COMPARATOR</a>(<a class="code" href="classreranker_1_1_default_gold_comparator.html" title="The default comparator for comparing two Candidate instances for being the &ldquo;gold&rdquo; candidate...">DefaultGoldComparator</a>)
<a name="l00056"></a>00056 
<a name="l00057"></a><a class="code" href="namespacereranker.html#ac9b843d8dc30423960cccc4da638666d">00057</a> <a class="code" href="candidate-set_8_h.html#a9fec9685a3457b12ed31ddc799a30166">REGISTER_CANDIDATE_SET_SCORER</a>(<a class="code" href="classreranker_1_1_default_candidate_set_scorer.html" title="The default candidate set scorer scores each candidate using the Model::ScoreCandidate method and the...">DefaultCandidateSetScorer</a>)
<a name="l00058"></a><a class="code" href="namespacereranker.html#ac16f586e7851bbb56563c2b962b342be">00058</a> <a class="code" href="candidate-set_8_h.html#a9fec9685a3457b12ed31ddc799a30166">REGISTER_CANDIDATE_SET_SCORER</a>(<a class="code" href="classreranker_1_1_random_pair_candidate_set_scorer.html" title="This candidate set scorer picks two candidates at random from the set, scores them and then identifie...">RandomPairCandidateSetScorer</a>)
<a name="l00059"></a>00059 
<a name="l00060"></a>00060 <span class="keywordtype">void</span>
<a name="l00061"></a><a class="code" href="classreranker_1_1_default_candidate_set_scorer.html#a1d6db4a2392e098c8afbef0e55b23fe1">00061</a> <a class="code" href="classreranker_1_1_default_candidate_set_scorer.html" title="The default candidate set scorer scores each candidate using the Model::ScoreCandidate method and the...">DefaultCandidateSetScorer</a>::Score(<a class="code" href="classreranker_1_1_model.html" title="Model is an interface for reranking models.">Model</a> *model,
<a name="l00062"></a>00062                                  <a class="code" href="classreranker_1_1_candidate_set.html" title="A class to hold a set of candidates, either for training or test.">CandidateSet</a> &amp;candidates, <span class="keywordtype">bool</span> training) {
<a name="l00063"></a>00063   <span class="comment">// N.B.: We assume there is at least one candidate!</span>
<a name="l00064"></a>00064   <a class="code" href="classreranker_1_1_candidate_set.html#a466bf9e9ff2852608e9e702f7182bb81">CandidateSet::iterator</a> it = candidates.begin();
<a name="l00065"></a>00065 
<a name="l00066"></a>00066   <span class="comment">// Score first candidate, which is perforce the best candidate so far.</span>
<a name="l00067"></a>00067   model-&gt;ScoreCandidate(*(*it), training);
<a name="l00068"></a>00068 
<a name="l00069"></a>00069   <a class="code" href="classreranker_1_1_candidate_set.html#a466bf9e9ff2852608e9e702f7182bb81">CandidateSet::iterator</a> best_it = it;
<a name="l00070"></a>00070   <a class="code" href="classreranker_1_1_candidate_set.html#a466bf9e9ff2852608e9e702f7182bb81">CandidateSet::iterator</a> gold_it = it;
<a name="l00071"></a>00071   ++it;
<a name="l00072"></a>00072 
<a name="l00073"></a>00073   <span class="comment">// Score any and all remaining candidates.</span>
<a name="l00074"></a>00074   <span class="keywordflow">for</span> ( ; it != candidates.end(); ++it) {
<a name="l00075"></a>00075     <a class="code" href="classreranker_1_1_candidate.html" title="A class to represent a candidate in a set of candidates that constitutes a training instance for a re...">Candidate</a> &amp;candidate = *(*it);
<a name="l00076"></a>00076     model-&gt;ScoreCandidate(candidate, training);
<a name="l00077"></a>00077     <span class="keywordflow">if</span> (model-&gt;score_comparator()-&gt;Compare(*model, candidate, **best_it) &gt; 0) {
<a name="l00078"></a>00078       best_it = it;
<a name="l00079"></a>00079     }
<a name="l00080"></a>00080     <span class="keywordflow">if</span> (model-&gt;gold_comparator()-&gt;Compare(*model, candidate, **gold_it) &gt; 0) {
<a name="l00081"></a>00081       gold_it = it;
<a name="l00082"></a>00082     }
<a name="l00083"></a>00083   }
<a name="l00084"></a>00084   candidates.set_best_scoring_index((*best_it)-&gt;index());
<a name="l00085"></a>00085   candidates.set_gold_index((*gold_it)-&gt;index());
<a name="l00086"></a>00086 }
<a name="l00087"></a>00087 
<a name="l00088"></a>00088 <span class="keywordtype">void</span>
<a name="l00089"></a><a class="code" href="classreranker_1_1_random_pair_candidate_set_scorer.html#a7abfd508156ab23d326794cab17bd530">00089</a> RandomPairCandidateSetScorer::Init(<span class="keyword">const</span> <span class="keywordtype">string</span> &amp;arg) { srand(time(NULL)); }
<a name="l00090"></a>00090 
<a name="l00091"></a>00091 <span class="keywordtype">size_t</span>
<a name="l00092"></a>00092 RandomPairCandidateSetScorer::GetRandomIndex(<span class="keywordtype">size_t</span> max) {
<a name="l00093"></a>00093   <span class="comment">// Get an index proportional to the reciprocal rank.</span>
<a name="l00094"></a>00094   <span class="comment">// First, get a floating-point value that is distributed uniformly (roughly)</span>
<a name="l00096"></a>00096 <span class="comment"></span>  <span class="keywordtype">double</span> r = rand() / (double)RAND_MAX;
<a name="l00097"></a>00097   <span class="comment">// We compute the cummulative density function, or cdf, of the</span>
<a name="l00098"></a>00098   <span class="comment">// reciprocal rank distribution over the fixed set of items.  As soon as</span>
<a name="l00099"></a>00099   <span class="comment">// our uniformly-distributed r is less than the cdf at index i, we</span>
<a name="l00100"></a>00100   <span class="comment">// return that index.</span>
<a name="l00101"></a>00101   <span class="keywordtype">double</span> cdf = 0.0;
<a name="l00102"></a>00102   <span class="keywordtype">double</span> denominator = (max * (max + 1)) / 2;
<a name="l00103"></a>00103   <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i &lt; max; ++i) {
<a name="l00104"></a>00104     cdf += (max - i) / denominator;
<a name="l00105"></a>00105     <span class="keywordflow">if</span> (r &lt;= cdf) {
<a name="l00106"></a>00106       <span class="keywordflow">return</span> i;
<a name="l00107"></a>00107     }
<a name="l00108"></a>00108   }
<a name="l00109"></a>00109   <span class="keywordflow">return</span> max - 1;
<a name="l00110"></a>00110 }
<a name="l00111"></a>00111 
<a name="l00112"></a>00112 <span class="keywordtype">void</span>
<a name="l00113"></a><a class="code" href="classreranker_1_1_random_pair_candidate_set_scorer.html#a9e1eba023ff20c3b354cc009bc885db1">00113</a> RandomPairCandidateSetScorer::Score(<a class="code" href="classreranker_1_1_model.html" title="Model is an interface for reranking models.">Model</a> *model,
<a name="l00114"></a>00114                                     <a class="code" href="classreranker_1_1_candidate_set.html" title="A class to hold a set of candidates, either for training or test.">CandidateSet</a> &amp;candidates, <span class="keywordtype">bool</span> training) {
<a name="l00115"></a>00115   <span class="comment">// First, pick two candidate indices at random.</span>
<a name="l00116"></a>00116   <span class="keywordtype">size_t</span> idx1 = GetRandomIndex(candidates.<a class="code" href="classreranker_1_1_candidate_set.html#aa04c4a91de2030af08f16b3bda90984a">size</a>());
<a name="l00117"></a>00117   <span class="keywordtype">size_t</span> idx2 = GetRandomIndex(candidates.<a class="code" href="classreranker_1_1_candidate_set.html#aa04c4a91de2030af08f16b3bda90984a">size</a>());
<a name="l00118"></a>00118   <a class="code" href="classreranker_1_1_candidate.html" title="A class to represent a candidate in a set of candidates that constitutes a training instance for a re...">Candidate</a> &amp;c1 = candidates.<a class="code" href="classreranker_1_1_candidate_set.html#ae64208b8b3a7e0b19f3be10e779e2630">Get</a>(idx1);
<a name="l00119"></a>00119   <a class="code" href="classreranker_1_1_candidate.html" title="A class to represent a candidate in a set of candidates that constitutes a training instance for a re...">Candidate</a> &amp;c2 = candidates.<a class="code" href="classreranker_1_1_candidate_set.html#ae64208b8b3a7e0b19f3be10e779e2630">Get</a>(idx2);
<a name="l00120"></a>00120 
<a name="l00121"></a>00121   <span class="comment">// Next, just score those two candidates.</span>
<a name="l00122"></a>00122   model-&gt;<a class="code" href="classreranker_1_1_model.html#a5c8423bb022156759515b808f93751a9" title="Scores a candidate according to either the raw or averaged version of this perceptron model...">ScoreCandidate</a>(c1, training);
<a name="l00123"></a>00123   model-&gt;<a class="code" href="classreranker_1_1_model.html#a5c8423bb022156759515b808f93751a9" title="Scores a candidate according to either the raw or averaged version of this perceptron model...">ScoreCandidate</a>(c2, training);
<a name="l00124"></a>00124 
<a name="l00125"></a>00125   <span class="comment">// Finally, set indices of best scoring and gold amongst just those two.</span>
<a name="l00126"></a>00126   <span class="keywordtype">int</span> score_cmp = model-&gt;<a class="code" href="classreranker_1_1_model.html#aa58b2fee786c6402ea7429f7c2d27431" title="Returns a pointer to the score comparator used by this model.">score_comparator</a>()-&gt;Compare(*model, c1, c2);
<a name="l00127"></a>00127   candidates.<a class="code" href="classreranker_1_1_candidate_set.html#a34bcb7712a2b693b53bb55cea253335e">set_best_scoring_index</a>(score_cmp &gt; 0 ? c1.index() : c2.<a class="code" href="classreranker_1_1_candidate.html#a614992f57ceed690dee107b1e4c40696" title="Returns the index of this candidate relative to the other candidates.">index</a>());
<a name="l00128"></a>00128 
<a name="l00129"></a>00129   <span class="keywordtype">int</span> gold_cmp = model-&gt;<a class="code" href="classreranker_1_1_model.html#ae13ea77e614feaf88faebfe37cd45224" title="Returns a pointer to the gold comparator used by this model.">gold_comparator</a>()-&gt;Compare(*model, c1, c2);
<a name="l00130"></a>00130   candidates.<a class="code" href="classreranker_1_1_candidate_set.html#a0bf052223c63c89219c33fd76a5779aa">set_gold_index</a>(gold_cmp &gt; 0 ? c1.index() : c2.<a class="code" href="classreranker_1_1_candidate.html#a614992f57ceed690dee107b1e4c40696" title="Returns the index of this candidate relative to the other candidates.">index</a>());
<a name="l00131"></a>00131 }
<a name="l00132"></a>00132 
<a name="l00133"></a>00133 <span class="keywordtype">void</span>
<a name="l00134"></a><a class="code" href="classreranker_1_1_model.html#a85e014c8643c0a12db3a891e4eb5dc5c">00134</a> Model::CheckNumberOfTokens(<span class="keyword">const</span> <span class="keywordtype">string</span> &amp;arg,
<a name="l00135"></a>00135                            <span class="keyword">const</span> vector&lt;string&gt; &amp;tokens,
<a name="l00136"></a>00136                            <span class="keywordtype">size_t</span> min_expected_number,
<a name="l00137"></a>00137                            <span class="keywordtype">size_t</span> max_expected_number,
<a name="l00138"></a>00138                            <span class="keyword">const</span> <span class="keywordtype">string</span> &amp;class_name)<span class="keyword"> const </span>{
<a name="l00139"></a>00139   <span class="keywordflow">if</span> ((min_expected_number &gt; 0 &amp;&amp; tokens.size() &lt; min_expected_number) ||
<a name="l00140"></a>00140       (max_expected_number &gt; 0 &amp;&amp; tokens.size() &gt; max_expected_number)) {
<a name="l00141"></a>00141     std::stringstream err_ss;
<a name="l00142"></a>00142     err_ss &lt;&lt; class_name &lt;&lt; <span class="stringliteral">&quot;::Init: error parsing init string \&quot;&quot;</span>
<a name="l00143"></a>00143            &lt;&lt; arg &lt;&lt; <span class="stringliteral">&quot;\&quot;: expected between &quot;</span>
<a name="l00144"></a>00144            &lt;&lt; min_expected_number &lt;&lt; <span class="stringliteral">&quot; and &quot;</span> &lt;&lt; max_expected_number
<a name="l00145"></a>00145            &lt;&lt; <span class="stringliteral">&quot; tokens but found &quot;</span> &lt;&lt; tokens.size() &lt;&lt; <span class="stringliteral">&quot; tokens&quot;</span>;
<a name="l00146"></a>00146     cerr &lt;&lt; err_ss.str() &lt;&lt; endl;
<a name="l00147"></a>00147     <span class="keywordflow">throw</span> std::runtime_error(err_ss.str());
<a name="l00148"></a>00148   }
<a name="l00149"></a>00149 }
<a name="l00150"></a>00150 
<a name="l00151"></a>00151 shared_ptr&lt;Candidate::Comparator&gt;
<a name="l00152"></a><a class="code" href="classreranker_1_1_model.html#ab33dc7e4ee114be828db6eebf15bc47c">00152</a> Model::GetComparator(<span class="keyword">const</span> <span class="keywordtype">string</span> &amp;spec)<span class="keyword"> const </span>{
<a name="l00153"></a>00153   <a class="code" href="classreranker_1_1_factory.html" title="Factory for dynamically created instance of the specified type.">Factory&lt;Candidate::Comparator&gt;</a> comparator_factory;
<a name="l00154"></a>00154   <span class="keywordtype">string</span> err_msg = <span class="stringliteral">&quot;error: model &quot;</span> + name() + <span class="stringliteral">&quot;: could not construct &quot;</span> +
<a name="l00155"></a>00155       <span class="stringliteral">&quot;Candidate::Comparator from specification string \&quot;&quot;</span> + spec + <span class="stringliteral">&quot;\&quot;&quot;</span>;
<a name="l00156"></a>00156   <span class="keywordflow">return</span>  comparator_factory.<a class="code" href="classreranker_1_1_factory.html#a68117013334b03c94fc525e62080311f" title="Dynamically creates an object, whose type and initialization are contained in a specification string...">CreateOrDie</a>(spec, err_msg);
<a name="l00157"></a>00157 }
<a name="l00158"></a>00158 
<a name="l00159"></a>00159 shared_ptr&lt;CandidateSet::Scorer&gt;
<a name="l00160"></a><a class="code" href="classreranker_1_1_model.html#a570719cf2126c0bb7d120a3dcd19f0f4">00160</a> Model::GetCandidateSetScorer(<span class="keyword">const</span> <span class="keywordtype">string</span> &amp;spec)<span class="keyword"> const </span>{
<a name="l00161"></a>00161   <a class="code" href="classreranker_1_1_factory.html" title="Factory for dynamically created instance of the specified type.">Factory&lt;CandidateSet::Scorer&gt;</a> candidate_set_scorer_factory;
<a name="l00162"></a>00162   <span class="keywordtype">string</span> err_msg = <span class="stringliteral">&quot;error: model &quot;</span> + name() + <span class="stringliteral">&quot;: could not construct &quot;</span> +
<a name="l00163"></a>00163       <span class="stringliteral">&quot;Candidate::Scorer from specification string \&quot;&quot;</span> + spec + <span class="stringliteral">&quot;\&quot;&quot;</span>;
<a name="l00164"></a>00164   <span class="keywordflow">return</span> candidate_set_scorer_factory.<a class="code" href="classreranker_1_1_factory.html#a68117013334b03c94fc525e62080311f" title="Dynamically creates an object, whose type and initialization are contained in a specification string...">CreateOrDie</a>(spec, err_msg);
<a name="l00165"></a>00165 }
<a name="l00166"></a>00166 
<a name="l00167"></a>00167 shared_ptr&lt;Model::UpdatePredicate&gt;
<a name="l00168"></a><a class="code" href="classreranker_1_1_model.html#a1f79bda31ef5b3ed236d77a79403d789">00168</a> Model::GetUpdatePredicate(<span class="keyword">const</span> <span class="keywordtype">string</span> &amp;spec)<span class="keyword"> const </span>{
<a name="l00169"></a>00169   <a class="code" href="classreranker_1_1_factory.html" title="Factory for dynamically created instance of the specified type.">Factory&lt;Model::UpdatePredicate&gt;</a> update_predicate_factory;
<a name="l00170"></a>00170   <span class="keywordtype">string</span> err_msg = <span class="stringliteral">&quot;error: model &quot;</span> + name() + <span class="stringliteral">&quot;: could not construct &quot;</span> +
<a name="l00171"></a>00171       <span class="stringliteral">&quot;Model::UpdatePredicate from specification string \&quot;&quot;</span> + spec + <span class="stringliteral">&quot;\&quot;&quot;</span>;
<a name="l00172"></a>00172   <span class="keywordflow">return</span> update_predicate_factory.<a class="code" href="classreranker_1_1_factory.html#a68117013334b03c94fc525e62080311f" title="Dynamically creates an object, whose type and initialization are contained in a specification string...">CreateOrDie</a>(spec, err_msg);
<a name="l00173"></a>00173 }
<a name="l00174"></a>00174 
<a name="l00175"></a>00175 shared_ptr&lt;Model::Updater&gt;
<a name="l00176"></a><a class="code" href="classreranker_1_1_model.html#a66309617d0bdc5a615d843b2ae88e9d8">00176</a> Model::GetUpdater(<span class="keyword">const</span> <span class="keywordtype">string</span> &amp;spec)<span class="keyword"> const </span>{
<a name="l00177"></a>00177   <a class="code" href="classreranker_1_1_factory.html" title="Factory for dynamically created instance of the specified type.">Factory&lt;Model::Updater&gt;</a> updater_factory;
<a name="l00178"></a>00178   <span class="keywordtype">string</span> err_msg = <span class="stringliteral">&quot;error: model &quot;</span> + name() + <span class="stringliteral">&quot;: could not construct &quot;</span> +
<a name="l00179"></a>00179       <span class="stringliteral">&quot;Model::Updater from specification string \&quot;&quot;</span> + spec + <span class="stringliteral">&quot;\&quot;&quot;</span>;
<a name="l00180"></a>00180   <span class="keywordflow">return</span> updater_factory.<a class="code" href="classreranker_1_1_factory.html#a68117013334b03c94fc525e62080311f" title="Dynamically creates an object, whose type and initialization are contained in a specification string...">CreateOrDie</a>(spec, err_msg);
<a name="l00181"></a>00181 }
<a name="l00182"></a>00182 
<a name="l00183"></a>00183 }  <span class="comment">// namespace reranker</span>
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